Collet chuck



March 28, 1950 GR NNA 2,502,216

COLLET CHUCK Fil'ed Aug. 20, 1948 INVENTOR JOSEPH J. GRIVNA Patented Mar. 28, 1950 '5 UNITED STATES PATENT OFFICE COLLET CHUCK Joseph J. Grivna, Minneapolis, Minn.

Application August 20, 1948, Serial No. 45,291 I 4 Claims. (Cl. 279-51) My invention relates for an object to provide a construction whereby work other than rods can be quickly and easily mounted in a collet chuck.

An object of my invention resides in utilizing a collet similar to those employed for chucking rods andto which jaws may be applied for holding work other than rods.

Another object of my invention resides in providing a construction whereby jaws of different form and shape may be attached to the same collet.

Another object of my invention resides in providing a construction by means of which the jaws may be quickly and securely attached to the jaw members of the collet.

' An object of my invention resides in constructing either the jaws or the collet with a groove, and in providing the other thereof with a tongue received within said groove, said groove and tongue being disposed near the outermost portion of the jaw members of the collet.

I Another object of the invention resides in providing a single fastener for securing each jaw to a jaw member of the collet and in disposing said fastener inwardly of the tongue and groove.

A feature of the invention resides in arranging the tongue and groove transversely of the radial medial plane of the jaw member.

An object of the invention resides in constructing the groove and tongue arcuate in form and concentric with the axis of the chuck.

A still further object of the invention resides in utilizing cap screwsfor securing the jaws to the jaw members of the collet.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

f In the drawings:

Fig. 1 is an end elevational view of a turret lathe with a collet chuck embodying my invention applied thereto.

Fig. 2 is a longitudinal elevational sectional view taken on line 2-2 of Fig. 1.

In the mounting of parts in a turret lathe, the collet chuck is one of the most convenient and accurate devices for holding the parts in position. An ordinary collet chuck, however, is only designed for chucking rods and small pieces, and

to collet chucks and ha For the purpose of illustrating the invention, '1

have shown in the drawings a portion of the spindle IU of a turret lathe. This spindle has a head II at one end thereof and is mounted in suitable bearings in the lathe proper and which have not been shown in the drawings. The spindle l and head II have a bore I2 extending completely through the same. The head II is provided with a ring l3 projecting outwardly its use is thus very limited. For the purpose of therefrom and which is formed with a tapered- Within the bore !2 is provided a surface I4. sleeve [5 which is adapted to engage the collet and to operate the same in a manner to be presently described in detail.

An operating mechanism l6 mounted on the end of the spindle It! serves to reciprocate the sleeve l5 in a direction toward the right as viewed in Fig. 2. This mechanism includes a flange H which is mounted on the end of the spindle Ill and which may be secured thereto in any suitable manner. Issuing from the flange I! are lugs l8. These lugs have pivoted to them levers l9'which' have fingers 21 extending inwardly through openings 22 in the spindle l0, and which engage the end 23 of the sleeve [5. The said levers are pivoted to the lugs I8 by means of pintles 24 which pass through said lugs and levers. Levers IS, in addition, include arms 25 which extend along the spindle 10. These arms have cam followers 26 at the ends of the same. Slidable along the spindle Ill is a collar 21 which has a cam 28 adapted to engage the cam followers 25 of the levers l9. A ringfor operating the collar 21, not shown in the drawings, is disposed in a groove 29 in the said collar. When the collar 21' is shifted toward the left, fingers 2| are urged against the end 23 of sleeve l5 and said sleeve moved toward the right.

The collet chuck of the invention includes a collet 3| which has a shank'32 extending into the bore 12 of spindle H]. The said collet fur ther has a head 33 extending outwardly beyond the bore of said spindle. shank 32 are formed with slits 34 which extend completely through the head 33 and partly along the shank 32 to form on the head 33 three jaws 35, 36 and 31. Since the jaws 35, 36 and 31 are all identical in construction, andsince the parts applied thereto are likewise identical, only the jaw 35 and the associated parts will be describedin detail. The head 33 is turned to form a ring 38 extending circumferentially with reference to the. axis of the chuck and at the outer portion of the same. Due to the slits 34, this ring is di= vided to form three tongues-41', 42 and '43 on the variousjaw members 35, 36 and 31- and which are arcuate in form.

The head 33'and the,

The head 33 of the collet 3| is constructed with a conical surface 44. This surface is adapted to be engaged by a similar surface 45 formed in a collar 45 Colla 46 encircles the ring I3 and has a conical surface 41 adapted to engage the surface 14 of said ring. By means of this construction, the collar 46 may be accurately centered with respect to the spindle in and the surface 45 brought into concentricity with the axis of the chuck. A number of cap screws 48 extend through the collar 46 and are screwed into the head ll of the spindle [0. This construction serves to hold the collar rigidly mounted on the spindle.

The invention utilizes three .jawsii, 52 and 53 which are attached to the jaw members 35, '36 and 31. Only the jaw will be described in detail. This jaw is constructed with a groove 54 of such shape'and-dimensions as to 'snuglyrece'ive the tongue 4-! of jaw member 35. The "said jaw has -a'portion 55 which extends inwardly of said groove'and-throughrwhich a capsscrew 55 extends. This cap screw is threadediinto thefi'aw member 35 inwardlyof the tongue' iiw Itwill be readily comprehended that the jaw 51 maybe mounted on the .jaw member 35 by merely applying the jaw 'to said jaw member with the groove 54 in position to receive the tongue 4 I. Thereafter the screw 56 may be applied and screwed into the jaw member 41.

The particular jaws shown in .thetinstant-application for patent are constructed to holdza face plate -51 having a hub 58 thereon. For this purpose eachof the jaws 51,52 and :53 tis constructed witha projectionfiil adapted to engage the flange of the face plate :51 at thecuter periphery thereof. When the-collet chuck is closed by.manipula tion .of "the-operating mechanism +6 the faceplate is held rigidly mounted :on the lathe spindle 1-0. While so mounted, the backof the face plate-may be finished and also the hub and the end of the same turned up. While the face plate is still mounted, the same rnay be bored and any other turning operation capable of being mer-formed whilethe face plate is so held maybe carried-out. In order that the boring tool maygo completely through the work, the jaws 51., 52 and State recessed as indicated at 61.

In the use of the invention, the-collet is normally left in. the lathe with the collar 46 choir-- cling the head v33 thereof and 'thezoperating mechanism It adjusted to procure closingof. the chuck Whenthe collar 2.1 is1moved-to the position shown in Fig. .2. When the chuck is desired for use, proper jaws are applied .to the jaw members .of the chuck :collet and the same .attachedthereto by the cap screws 6. Thecolletehuok is then ready for use. In the use of the same, the work is applied to the: collet and inserted within theprojection 59 and the operating mechanism of the chuck manipulated in the usual manner.

The advantages of invention are manifest. The same accuracy canbe .procuredlin thecentering of pieces of work other than rods and the like, as is :possibl'ewitha .colletchuck used on'rods. The piecescan be inserted in the chuck quickly, and the chuck closed in almost thesame length of. time as required for the :operation of .acollet chuck on rods. The jaws can be. quickly and easily removed and other jaws attached to the jaw members of the collet whenever it becomes desirable. A. single fastener member is all that is necessary :for securing each jaw .to the jaw member 'of: the collet. Such fastener or screw is new and desire to protect by Letters Patent is:

1. In a collet chuck, a collet having a number of jaw members-circumferentially arranged and having end :faces disposed at right angles to the axis of the chuck, a shoulder on each of said jaw members projecting away from said faces thereof, said shoulder being disposed toward the outermost portion ofthe jaw member and extending .in

. a direction transverse to the medial :radial .plane of said jaw member, a jaw for cooperation with each of said jaw members .and having a shoulder engaging the-shoulder of said jaw member and a single fastener extending through .said jaw and.

attached to said jaw member, said fastener being disposed radially inwardly of said shoulder.

2. In a collet chuck, a collet having a number of jaw members circumferentiall arranged and havingend faces disposed at right .angles to the axis of the chuck, a jaw mounted on the face .of each of said jaw members, each jaw and jaw member having juxtaposed .partaagroove in one of said parts and a tongue on the other of said parts, said tongue being received within said groove and extending in a direction transverse of the radial medial plane of the chuck and .a single fastener disposed radially inwardly of said groovasaid fastener extending through the jaw and being attached to the jaw member.

2. In a collet chuck, acollet havinga number of jaw members .circurnierentially arranged and having. end faces disposed at right angles to the axis of the chuck, a groove in each of said jaw members, a jaw mounted on the .face of each of said jaw members and having a part received within said groove, said groove extending in a direction transverse of the .radial medial I plane of the chuck and .a single fastener member disposed radially inwardly of the said-groove,:said fastener extending through the jaw and being attached to the jaw member.

4. In a collet chuck, a collethaving a number of jaw members circumferentially arranged and having end faces disposed at right angles to the axis of the chuck, a jaw mounted on the .face of each of said jaw members, each jaw and jaw member having juxtaposed parts, an arcuate groove in one of said parts concentric with the CECE!) l-Th'e .ioilowing references are of record in 'the file ofthis patent:

UNITED STATES PATENT-"S Number Name Date 685,963 Allen -NOVyBQ'IQQI 968,051 Hanson Aug. 23, 1-910 1265,60'6' Busch May 7,1918 

